Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter cluster.

GCV

1   2    3    4   5    6   7     8    9  10  11  12  13

 A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

THE LOGIC FOLLOWED HERE IS;

1) BJT,

B(2) x J(10) = T(20)

2) GCV,

G(7) x C(3) = U(21) not V(22)

3) DDP,

D(4) x D(4) = P(16)

4) FBL,

F(6) x B(2) = L(12)

Thus, GCV is the odd one.